CN115620721A - System and method for acquiring audio record - Google Patents
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Abstract
The invention belongs to the technical field of voice recording equipment in an airplane, and particularly relates to a system and a method for acquiring audio records, wherein the system comprises: the system comprises an audio acquisition recorder and a cloud server which are arranged in a machine cabin; the audio acquisition recorder receives a user instruction given by the cloud server, acquires and stores the audio data of the cabin, and monitors the main wheel-off/landing and cabin door opening/closing signals to control the working mode of the system; the cloud server receives a user instruction of the client terminal and controls the audio acquisition recorder to realize management, storage and playing of audio data. The system provided by the invention is a system which meets the requirement that the CTSO-2C603 quickly obtains the lowest performance standard of the cockpit audio recorder, and solves the problems that the existing system needs manual operation and professionals process SD card data.
Description
Technical Field
The invention belongs to the technical field of voice recording equipment in an airplane, and particularly relates to a system and a method for acquiring audio records.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
At present, all civil aircrafts are generally provided with Cockpit audio recorders (CVR), meet the FAA Federal aviation administration TSO-C124a or European ED-56A standard, can record 4 channels and 2h audio data of each channel, and use special equipment to download the audio data after the flight is finished so as to be used for survey analysis. The CVR has the problems of short recording time and inconvenient data acquisition, an airline company provides a requirement for quickly acquiring audio data for saving labor cost and improving maintenance efficiency, and a manufacturer designs and manufactures a Quick acquisition cockpit audio Recorder (QACVR) based on SD, meets the CTSO-2C603 standard, realizes Quick acquisition of the audio data in a manual disk changing mode after navigation, and improves efficiency. However, the device still has the problems of manual operation and processing of SD card data by professionals.
Disclosure of Invention
To overcome the above-mentioned deficiencies of the prior art, the present invention provides a system and method for acquiring an audio recording.
In order to achieve the above object, one or more embodiments of the present invention provide the following technical solutions:
a first aspect of the invention provides a system for obtaining an audio recording, comprising: the audio acquisition recorder and the cloud server are installed in the machine cabin;
the audio acquisition recorder receives a user instruction given by the cloud server, acquires and stores the audio data of the cabin, and monitors the main wheel-off/landing and cabin door opening/closing signals to control the working mode of the system;
and the cloud server receives a user instruction of the client terminal and controls the audio acquisition recorder to realize management, storage and playing of audio data.
The second aspect of the present invention provides a method for acquiring audio data, which is based on a system for acquiring audio records, and includes:
the audio acquisition recorder receives a user instruction given by the cloud server, acquires and stores the audio data of the cabin, and monitors the main wheel-off/landing and cabin door opening/closing signals to control the working mode of the system;
when any condition of the main wheel lift-off and the cabin door closing is met, the system works in an acquisition recording mode and continuously acquires and stores audio data;
when the main wheel lands on the ground and the cabin door is opened, the system is switched to a data uploading mode, data are uploaded to the server one by one, and the server manages and stores the data;
when the audio acquisition recorder receives an instruction transmitted by the server, the system enters a monitoring maintenance mode to perform maintenance self-check, channel monitoring and troubleshooting.
The above one or more technical solutions have the following beneficial effects:
the device provided by the invention is a device which meets the minimum performance standard of a CTSO-2C603 for rapidly acquiring a cockpit audio recorder (QACCVR), realizes the acquisition and storage of audio data, and transmits the data to a server through a 4/5G network when the landmark conditions such as landing of a main wheel or opening of a cabin door are met, the server side provides the management, storage and playing services of the data, and the client side can browse, download or play the concerned audio information through a terminal web browser; the problem that the existing equipment needs manual operation and professionals to process SD card data is solved.
Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are included to illustrate an exemplary embodiment of the invention and not to limit the invention.
FIG. 1 is a system configuration diagram of embodiment 1 of the present invention;
fig. 2 is a power supply circuit configuration diagram of embodiment 1 of the present invention;
FIG. 3 is a schematic diagram of the connection of an audio codec according to embodiment 1 of the present invention;
FIG. 4 is a structure diagram of an FPGA according to embodiment 1 of the present invention;
FIG. 5 is a diagram showing the structure of a main controller in embodiment 1 of the present invention;
fig. 6 is a structural diagram of an ARNIC429 decoder according to embodiment 1 of the present invention;
fig. 7 is a flow chart of system operation mode switching according to embodiment 1 of the present invention;
FIG. 8 is a flowchart of an audio receiving thread according to embodiment 1 of the present invention;
FIG. 9 is a flowchart of a playback thread according to embodiment 1 of the present invention;
FIG. 10 is a flowchart of a data recording thread according to embodiment 1 of the present invention;
FIG. 11 is a flowchart of a 4G/5G communication thread according to embodiment 1 of the present invention;
FIG. 12 is a schematic structural diagram of a system according to embodiment 1 of the present invention;
fig. 13 is a functional schematic diagram of an audio cloud server according to embodiment 1 of the present invention.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention.
The embodiments and features of the embodiments of the present invention may be combined with each other without conflict.
Example one
As shown in fig. 1, the present embodiment discloses a fast acquisition audio recording system, including: the audio acquisition recorder and the cloud server are installed in the machine cabin;
the audio acquisition recorder receives a user instruction given by the cloud server, acquires audio data of the storage cabin, and monitors the main wheel-on/ground and the cabin door opening/closing signal to control the working mode of the system;
the cloud server receives a user instruction of the client terminal and controls the audio acquisition recorder to realize management, storage and playing of audio data; and the client terminal accesses the cloud server through the terminal webpage browser to browse, download or play the concerned audio data.
The audio acquisition recorder comprises a power supply circuit, an audio codec, a main controller, an input preprocessing circuit, an output amplifying circuit, an ARNIC429 decoder, a 4/5G transmission module, a switch acquisition circuit, an SD memory card and embedded software running on the main controller; the audio codec, the ARNIC429 decoder, the 4/5G transmission module, the switch acquisition circuit and the SD memory card are respectively connected with the main controller;
a main wheel landing switch and a cabin door opening switch of the airplane are connected to a switch acquisition circuit of the audio acquisition recorder, main wheel landing/landing and cabin door opening/closing signals are input to GPIO (General-purpose input/output) on the HPS side of the main controller after level conversion, and when the main wheel lands or the cabin door is opened, a level interrupt signal is generated by the GPIO to inform a main program to start mobile data transmission service;
as shown in fig. 2, the power supply circuit includes two paths, which are a dc conversion circuit and an ac power supply circuit. The input of the direct current power supply is 28V direct current, and the alternating current power supply is 115V; the alternating current power supply circuit and the direct current power supply circuit share the power supply protection circuit, the power supply monitoring circuit and the DC-DC conversion circuit, and the output of the DC-DC conversion circuit is 5V, 3.3V, 2.5V and 1.1V power supply. The alternating current power supply circuit and the direct current power supply circuit are isolated through an isolation diode; the power supply circuit is used for supplying power to each circuit module of the audio acquisition recorder. The power circuit has protection and monitoring functions, the protection circuit comprises overvoltage protection, overcurrent protection, overheat protection and the like, and the monitoring circuit can provide power-on and power-off indication signals.
As shown in fig. 3, the audio codec uses a PCM3168A single chip scheme, supporting a sample rate of 8kHz to 96kHz, 6-way 2Vrms differential audio input and 8-way 8Vpp audio differential output, supporting SPI and IIC control interfaces. The collected audio input signal audio is firstly preprocessed by an audio input preprocessing circuit, then transmitted to an audio coder/decoder, and finally transmitted to an earphone by an output amplifying circuit; the audio codec interfaces are I2S and I2C, are connected to the FPGA side of the main controller, and are used for realizing the setting of the audio codec and the receiving and sending control of audio data by FPGA audio codec logic.
The output end of the audio input preprocessing circuit is connected with the input end of an audio codec, the output end of the audio codec is connected with the input end of an output amplifying circuit, and the output end of the output amplifying circuit is connected with external audio output equipment; the audio input preprocessing circuit adjusts the analog audio signals input on the airplane to be within the range of 2Vrms so as to meet the input level and impedance requirements of the audio coder-decoder, and the output amplifying circuit adjusts the output of the audio coder-decoder DA to be within the range of impedance and voltage required by external audio output equipment.
As shown in fig. 4, the FPGA audio codec logic implements functions of the audio codec PCM3168A, such as power-on configuration, receiving ADC data, storing audio data, using an AVALON bus interface, sending DAC data for playback, and the like; the FPGA comprises an initialization module, an ADC data receiving module, a data sending module, a data storage module and an Avalon bus interface module;
the clock divider module invokes a Phase Locked Loop (PLL) IP core to generate a 12Mhz clock as the primary clock signal for PCM3168A using a PLL.
The initialization module comprises a power-on configuration module, the power-on configuration module comprises an I2C configuration module and an I2C driving module, the I2C configuration module generates configuration data according to the register configuration requirement of the audio coding and decoding chip, the I2C driving module is called to read and write the data, the I2C driving module generates a clock and data SDA according to the I2C protocol specification, and the I2C reading and writing operation is executed.
The ADC data receiving module receives audio channel data output by PCM3168A analog-to-digital conversion (ADC) according to I2S protocol specifications in the sequence of channels 1-6, performs serial-to-parallel conversion work of serial data, and writes the data into a DDR3 memory through the data storage module.
And the DAC data sending module reads the audio data in the memory according to the channel number, and after the audio data are subjected to parallel-serial conversion, the audio data are sent to the digital-to-analog conversion module of the PCM3168A through the I2s interface so as to drive the audio to be output to the playing equipment.
As shown in fig. 5, the main controller is composed of external circuits such as a cycleev chip, a DDR3 chip, an eMMC memory (Embedded Multi Media Card), and a clock, and the DDR3 chip, the eMMC, and the clock external circuit are connected to the cyclone V chip, respectively;
DDR3 is a system operation memory and can provide high-speed instruction and data moving capacity for the system;
the eMMC provides a storage space for system logic, binary instruction codes and system operation parameters, and can be used for storing user data;
the CycloneV chip consists of an FPGA and an HPS (hard core processor system), the FPGA can conveniently and flexibly construct various logic circuits, the HPS is provided with an ARM Cortex-A9 core, and a linux system is embedded, so that a user can conveniently write protocol codes and user programs. The FPGA and the HPS are in data communication through an internal AXI bus.
As shown in fig. 6, the ARNIC429 decoder implements extraction of AXI bus data, and receives information such as valid UTC time from the AXI bus data, and the information is used to timestamp 6 audio channels respectively. The ARNIC429 decoder consists of a clock generation module, an NR bipolar code type conversion module, a label identification module, a receiving controller and an Avalon bus interface module.
The NR bipolar coding transformation is used for converting NR bipolar coding into unipolar non-return-to-zero codes; each word of ARNIC429 bus data consists of 32 bits, the lower 8 bits are labels which correspond to the parameter names of the data words one by one, the label identification module is used for extracting the labels from the received data, and the receiving controller can determine whether the required parameters are required according to the labels so as to decide whether to carry out subsequent receiving decoding logic.
The 4/5G transmission module selects a Middling Internet of things F03X module, the power supply voltage of the Middling Internet of things F03X module is 3.3V, the maximum uplink rate is 1.2Gbps, the maximum downlink rate is 2Gbps, a 5G NR/LTE-TDD/LTE-FDD/HSPA + communication mode is supported, the Middling Internet of 4G is compatible with a 7-mode 16-frequency communication mode, the 4/5G transmission module adopts an M.2 interface, supports NSA and SA dual modes, and can provide stable GNSS positioning service. The 4/5G transmission module is connected with the HPS of the main controller, and the embedded software can be compiled for network data transmission after the driver is installed.
The embedded software runs on the ARM side of the main controller based on a linux system platform and comprises a driver, a mode control thread, an audio receiving thread, a playing thread, a data recording thread and a 4G/5G communication thread; the functions of audio data acquisition, ARNIC429 data reception, data storage, management control and the like are realized.
The driver is mainly driven by an ARNIC429 based on character string equipment, the receiving channel of the ARNIC429 is mapped into a character type equipment, a read function is written to realize reading of UTC time, and an IOCTRL function is written to realize setting functions such as label setting, interrupt enabling, receiving quantity, error clearing and the like. The application operates the device through OPEN, CLOSE, READ, IOCTRL.
static int arnic429_open(struct inode *inode, struct file *filp)
static int arnic429_release(struct inode *inode, struct file *filp)
static ssize_t arnic429_read(struct file *filp, char __user *buf, size_t cnt, loff_t *offt)
static int arnic429_ioctl (struct inode *inode, struct file *filp,unsigned int cmd, unsigned long arg)
As shown in fig. 7, the mode control thread is used for receiving user instructions given by the server, monitoring signals of main wheel on/off, hatch door on/off and the like, and controlling the working mode of the equipment. The working modes of the equipment mainly comprise an acquisition recording mode, a data uploading mode and a monitoring maintenance mode.
The acquisition and recording mode condition is a main working mode, when any one of the conditions of the main wheel being off the ground and the cabin door being closed is met, the equipment carries out the mode, and continuously carries out acquisition and storage of audio data, and at the moment, the 4G/5G module does not work; when the main wheel lands on the ground and the cabin door is opened, switching to a data uploading mode, uploading the data recorded in the SD memory card to a server one by one, and managing and storing the data by the server; when receiving an instruction transmitted by the server, the monitoring maintenance mode is entered, and the work of maintenance self-check, channel monitoring, troubleshooting and the like can be carried out on the equipment.
As shown in fig. 8, the audio receiving thread operates in an acquisition recording mode, cooperates with the FPGA logic, periodically acquires audio data of 6 channels acquired by the FPGA and UTC time information transmitted on the ARNIC429 bus from the DDR3 according to a customized communication protocol, compresses the audio data into an MP3 format, inserts the time information into the audio information according to a certain format, performs framing and pushing into a data queue of each channel, and notifies the data recording thread to read and store the audio data and the UTC time information.
As shown in fig. 9, the playing thread works in the maintenance listening mode, and the terminal searches for the audio data information stored in the location recorder through the server instruction, and specifies the file or time slot to be played. The embedded software reads the audio data from the memory card, strips the time stamp, decompresses the audio data into PCM (Pulse Code Modulation) Code, sends the PCM Code to an I2S interface at the FPGA side, and outputs and plays the PCM Code from the DAC.
As shown in fig. 10, the data recording thread prepares a file first, monitors whether the data packet is a valid data packet, analyzes the notification information, extracts the channel number and the number of data packets in the queue, and stores the data into the file according to the channel number.
As shown in fig. 11, the 4G/5G communication thread works in a data uploading mode, monitors the main wheel on/off and the hatch door open/close signal, connects to the server, uploads the data recorded this time to the server for storage by using the TCP protocol, and stores the uploading record in the uploading process to confirm whether the data is completely transmitted, or else, performs breakpoint transmission when the transmission condition is met next time.
As shown in fig. 12, the system includes a human-computer interaction layer, a background service layer and a data storage layer; the cloud server is erected at the cloud end and adopts a B/S architecture, the cloud server end is in a Linux centros 7+ Apache + PHP + MySQL environment, and a core service PHP program and a management service PHP program are operated;
the client is a browser web access mode and is compatible with mobile end platform access, the Server and client data interaction process is that a user accesses a web service provided by Apache (Apache HTTP Server) on a Linux system through computer browser (Google Chrome or other components compatible with JS/jquery and the like) software, submits a request to a PHP core service code running at the Server, acquires flight number and flight audio data recording information, and presents the information on a page through a visual interface after the information is processed by JS code of the browser so as to be selected and used by the user.
As shown in fig. 13, the services provided by the cloud server include an on-board device uploading audio service, a terminal uploading data service, a user audio on-demand service, a management service, and the like.
The airborne equipment uploads the audio service to monitor the airborne equipment to connect with the server, establishes connection, receives TCP data and stores and manages the data according to a storage management strategy.
The terminal upload service monitors the terminal connection request, and executes uplink and downlink transmission according to the user request instruction of the terminal after establishing the connection. If the request is an uploading service request, judging that the uploading log information of the audio recording data needs to be uploaded, matching an uploading point, and deciding whether to upload again or continue to upload at a breakpoint.
The audio on demand service carries out data positioning according to flight number, channel number and time slice information appointed by the user, realizes that the user selects a resume through a browser to carry out audio on demand, provides accurate/fuzzy searching functions of selecting audio time periods, channel numbers and the like, and supports seek fast forward and fast backward.
The system management service includes unit management, user management, data management, and the like. The unit management is used for carrying out addition, deletion and modification operation on the authorized use units; the user management is used for performing operations such as addition and deletion operations, configuration of access authority, password resetting and the like on the user of the unit. Data management is limited to administrators, and is used for changing data usage rights, deleting data, and the like.
The terminal equipment can be a fixed PC, a mobile phone, a PAD and other mobile terminals, and the functions of data downloading, data searching and browsing, forced recording state entering, data playing and the like can be realized by accessing the server through a browser installed on the terminal. Data uploading can be achieved through APP software, and the data can be used as an effective supplement that the data are not uploaded to a server through 5G under special conditions such as network unsmooth and equipment abnormity.
Example two
The embodiment provides a method for acquiring audio data, which is based on a system for acquiring audio records, and comprises the following steps:
the audio acquisition recorder receives a user instruction given by the cloud server, acquires and stores the audio data of the cabin, and monitors the main wheel on/off and the cabin door on/off signal to control the working mode of the system;
when any condition of the main wheel off the ground and the cabin door closing is met, the system works in an acquisition recording mode and continuously acquires and stores audio data;
when the main wheel lands on the ground and the cabin door is opened, the system is switched to a data uploading mode, data are uploaded to the server one by one, and the server manages and stores the data;
when the audio acquisition recorder receives an instruction transmitted by the server, the system enters a monitoring maintenance mode to perform maintenance self-check, channel monitoring and troubleshooting.
Specifically, the collection and storage of audio data are continuously performed, including:
an audio coder-decoder acquires audio data in an engine room and preprocesses the audio data;
the ARNIC429 decoder compresses the preprocessed audio data into a queue after data compression, time labeling and data framing, and sends out a data effective notice.
Specifically, the host controller receives a notification sent by the ARNIC429 decoder, parses the notification information, extracts a channel number and the number of data packets in the queue, and stores audio data into the SD memory card according to the channel number.
Specifically, the 4G/5G transmission module uploads the data recorded in the SD card to the server for storage in a TCP protocol, and the upload record is saved during the upload process to determine whether the data is completely transmitted, or else, the data is continuously transmitted at a breakpoint when the transmission condition is met next time.
The terminal searches the audio data information stored in the positioning data acquisition recorder through the server instruction, and specifies a file or a time period to be played;
the data acquisition recorder receives the server instruction, reads the audio data from the SD card, strips the time stamp, decompresses the audio data into PCM code, and plays the PCM code after output amplification processing.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive changes in the technical solutions of the present invention.
Claims (10)
1. A system for obtaining an audio recording, comprising: the audio acquisition recorder and the cloud server are installed in the machine cabin;
the audio acquisition recorder receives a user instruction given by the cloud server, acquires and stores the audio data of the cabin, and monitors the main wheel-off/landing and cabin door opening/closing signals to control the working mode of the system;
and the cloud server receives a user instruction of the client terminal and controls the audio acquisition recorder to realize management, storage and playing of audio data.
2. The system for acquiring audio recording according to claim 1, wherein the audio acquisition recorder comprises a power circuit, an audio codec, a main controller, an ARNIC429 decoder, a 4/5G transmission module, a switch acquisition circuit and an SD memory card;
the audio coder-decoder is connected to the main controller, and the main controller is used for realizing the setting of the audio coder-decoder and the receiving and sending control of audio data;
the audio codec is respectively connected with an input preprocessing circuit and an output amplifying circuit, and the input preprocessing circuit and the output amplifying circuit are used for adjusting the impedance and the voltage range of an analog audio signal;
the ARNIC429 decoder is used for extracting AXI bus data of the main controller, receiving effective UTC time information from the AXI bus data and respectively marking timestamps to 6 paths of audio channels;
and the 4/5G transmission module is used for writing embedded software for data transmission after the driver is installed.
3. The system of claim 1, wherein the audio recording is obtained from a digital audio recording,
the switch acquisition circuit of the audio acquisition recorder receives signals of a main wheel grounding switch and a cabin door opening electric door switch from the airplane, the signals are input to GPIO (general purpose input output) on the HPS (host processor system) side of the main controller after level conversion, and when the main wheel is grounded or the cabin door is opened, level interruption signals are generated by the GPIO to inform the main controller of switching the system working mode.
4. The system for obtaining an audio recording of claim 1, wherein the system operating mode comprises:
the audio acquisition recorder acquires and stores audio data in an acquisition and recording mode;
the data uploading mode is that the audio acquisition recorder uploads the data to the server one by one;
and monitoring a maintenance mode, wherein the audio acquisition recorder monitors the channel in the mode.
5. The system of claim 2, wherein the power circuit comprises a dc power circuit and an ac power circuit; the alternating current power supply circuit and the direct current power supply circuit share the power supply monitoring circuit, the power supply protection circuit and the DC-DC conversion circuit, and the alternating current power supply circuit and the direct current power supply circuit are isolated through the isolation diode.
6. A method of acquiring audio data, a system for acquiring audio recordings according to any one of claims 1 to 5, comprising:
the audio acquisition recorder receives a user instruction given by the cloud server, acquires and stores the audio data of the cabin, and monitors the main wheel-off/landing and cabin door opening/closing signals to control the working mode of the system;
when any condition of the main wheel lift-off and the cabin door closing is met, the system works in an acquisition recording mode and continuously acquires and stores audio data;
when the main wheel lands on the ground and the cabin door is opened, the system is switched to a data uploading mode, data are uploaded to the server one by one, and the server manages and stores the data;
when the audio acquisition recorder receives an instruction transmitted by the server, the system enters a monitoring maintenance mode to perform maintenance self-check, channel monitoring and troubleshooting.
7. The method for acquiring audio data according to claim 6, wherein the continuously acquiring and storing audio data includes:
an audio coder-decoder acquires audio data in an engine room and preprocesses the audio data;
the ARNIC429 decoder performs data compression, time marking and data framing on the preprocessed audio data and then presses the preprocessed audio data into a queue to send out a data valid notification.
8. The method of claim 7, wherein the host controller receives the notification from the ARNIC429 decoder, parses the notification, extracts the channel number and the number of packets in the queue, and stores the audio data into the SD memory card according to the channel number.
9. The method for acquiring audio data according to claim 6, wherein the 4G/5G transmission module uploads the data recorded in the SD card to the server for storage in a TCP protocol, and the upload record is saved during the upload process to confirm whether the data is completely transmitted, or else, the breakpoint transmission is performed when the transmission condition is satisfied next time.
10. The method for acquiring audio data according to claim 6, wherein the client terminal searches the audio data information stored in the positioning data acquisition recorder through the server instruction, and specifies a file or a time period to be played;
the data acquisition recorder receives the instruction of the server, reads the audio data from the SD memory card, strips the time stamp, decompresses the time stamp into PCM code, and finally plays the PCM code after output amplification processing.
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